Westel e



(No Model.) W. E. HAWKINS.

MAGHINB FOR BMBOSSING METAL,

Patented Sept. 30; 1890.

UNITED STATES PATENT Orricr.

WESTEL E. HAWKINS, OF \VALLINGFORD, CONNECTICUT, ASSIGNOR TO THESIMPSON, HALL, MILLER & COMPANY, OF SAMEPLACE.

MACHINE FOR EMBOSSING METAL.

SPECIFICATION forming part of Letters Patent No. 437,432, datedSeptember 30, 1890.

' Application filed March 10,1890.

To all whom it may concern:

- and State of Connecticut, have invented new Improvements in Machinesfor Embossing Metal; and I do hereby declare the following, when takenin connection with accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in--- Figure 1, a side view of the apparatus with the partsstanding as about to impart the blow, the blow being represented by thehammer in broken lines, the return-stroke of the bar and hammer alsorepresented in broken lines; Fig. 2, a top or plan view of the same;Fig. 3, a front view, the hammer-arm broken away for convenience ofillustration; Fig. 4, the invention arranged as for double operation.

This invention relates to a device for performing the, preliminary workof embossing ductile metalssuch, for illustration, as hollow ware. Theembossing of such metals is generally produced by applying upon thereverse side a soft or yielding material, as a combination of pitch,which, while presenting a support to the metal, will yield to anyconsiderable pressure or force applied to the opposite side of themetal, and the embossing is usually performed by means of an instrumentheld in one hand, the point of the instrument presented upon the surfaceto'be operated upon, and then struck by a hammer in the other hand,being entirely a hand operation. Much of the raising or depressing ofthe metal is to a considerable extent produced by degrees, and as itmust be the operation is an expensive one.

The object of my invention is the construction of a machine whereby thepreliminary embossing maybe mechanicallyproduced and with much greaterrapidity than when produced by hand; and the invention consists in thearrangement of a rapidly-vibrating hammer adapted to produce a yieldingstroke, the hammer presenting a face corresponding substantially to theface of the instrument usually employed by hand, and so that thevibrations of said hammer will produce a rapid Serial No. 343,297. (Nomodel.)

succession of blows upon the surface of the metal to extend or stretchthe metal substantially the same as in the hand operation, as more fullyhereinafter described.

In the best adaptation of the machine I arrange the parts so that it maybe set into a common lathe and operated by the usual rotation of themandrel.

A represents the head of the machine, which is applied to a lathe. It isconstructed with a shank B to set into the post C ofa latherest, whereit maybe secured by the usual set-screw D. The head stands vertical, asshown, and in the head a bar E is hung upon an axis F in the head, so asto swing freely up and down, that it may receive a vibratory movement inavertical plane. Such vibratory movement is produced by the conversionof a rotary movement to such vibratory movement. To accomplish this thebar is constructed with a vertical arm G extending upward andconstructed with a vertical slot H, in which slot a slide I is arrangedto work freely up and down.

K represents a crank, which is made fast in the revolving mandrel L ofthe lathe, and so as to revolve with the mandrel in a vertical planeparallel with the arm G. This crank carries a crank-pin M, which extendsinto the slide I. The throw of the crank is very slight. The revolutionof the crank will impart a vibratory movement to the arm G,.

which will be communicated to the bar E, and so that bar will swing upand down, as indicated by broken lines, Fig. 1, and this vibra tion ofthe arm should be very rapid. The arm is counterbalanced by an extensionN from the pivot opposite to the bar E. At the end of the bar E thehammer-arm O is hung upon a pivot P, so as to swing in a vertical planeindependent of the arm E, yet to partake of the vibratory movement ofthe bar. A spring Q is arranged at the rear of the pivot P, upon whichthe tailR of the hammer may rest, and forward of the pivot an adjusting-screw S is arranged, which limits the extent of movement whichthe hammer-arm may be permitted independent of thebar E that is to say,the adjustment is such as to allow a limited extent of free play to thehammer-arm. At the outer end of the hammer-arm the hammer-head T isarranged. This is in the form of a stud, presenting a rounded endcorresponding substantially to the end of the instrument usuallyemployed by hand for embossing.

As the bar E rises under its vibratory movement, it carries with it thehammer-arm until the extreme upward movement of the bar E is reached,and, as seen in Fig. 1, the tail of the hammer resting against thespring Q in such upward movement; but as the upstroke of the bar iscompleted the momentum thus imparted to the hammer-arm will cause it torise until it strikes the adjusting-screw S, and, as represented inbroken lines, Fig. 1, thus the hammer receives a slight overmotion,which makes the blow elastic and substantially the same as a blow of thehammer by hand. As the bar E returns to the down position, as in brokenlines,Fig. 1, the hammer also returns, and the momentum which isimparted by the descent will cause a similar overmotion to thehammer-arm, which will be met by the spring Q and the spring somewhatcompressed, and the reaction of this compression of the spring will beimparted to the hammer-arm with a tendency to raise the hammer. Thevibrations being very rapid, this reaction of the spring will beproduced on the rise of the hammer to impart its blow. I The reaction ofthe spring therefore I gives to the hammer an elastic stroke.

The surface of the metal to be operated upon is placed in a positionwith relation to the hammer substantially the same as it is usuallyarranged with relation to the hand instrument, so that the blow of thehammer will be imparted at the required point, the operator moving andadjusting the metal as he moves and adjusts the hand instrument, so thatthe blows maybe produced at the point required and the drawing orembossinggradually produced by successive blows, substantially asproduced with a hand instrument. The slide I works in the slot H as thecrank revolves in the usual manner for such slides where rotary movementof a crank is required to be converted into vibratory movement. Thecrank-pin is made adjustable as to throw by being arranged in alongitudinal groove in the crank in the usual manner of adjusting thethrow of a crank.

, the bar, as described, a like hammer may be arranged at both ends ofthe bar, so that two operators may work at the same machine,

7 as seen in Fi 4; but it is not to be understood that thecounter-balance is essential, but simply that its use is desirable.

I illustrate only a portion of the rest and of the mandrel of the lathe,the construction of the lathe being too well known to require fullillustration or description. It will also be understood that theapparatus may be a full organized machine, but that in such organizedmachine the mechanical parts would correspond to the mandrel of thelathe for imparting the rotary movement to the crank, and the supportfor the head would correspond to the rest of the lathe.

I claim 1. In an apparatus for embossing metal, the combination of avibrating bar, mechanism, substantially such as described, for impartingvibratory movement to said bar, and ahammer arm pivoted to saidvibrating bar and so as to swing in the same plane as the plane of.vibration of the bar, the said hammer-armcarrying the hammer-head, thehammer-arm being adapted to partake of the vibration of the bar, but yetadapted to swing upon its own pivot independent of said bar,substantially as described.

2. The combination of the head A, the bar E, hung upon a pivot thereinand so as to vibrate freely, a crank in connection with said bar,whereby the rotary movement of the crank will be converted intovibratory-movement of said bar, and a hammer-arm O, hung to the end ofsaid bar E and so as to swing in the plane of movement of the bar Eindependent of said bar, the bar carrying a head T at its free end, withan adj UStlllg-SCIGW adapted to limit the extent of such independentmovement of the hammer-arm, substantially as described.

3. The combination of the vibrating bar E, the hammer-arm O, hungtherein and carrying the hammer-head T, the adj Listing-screw S in saidbar on one side of a pivot adapted to stop the swinging of said arm inone direction, and a spring arranged to resist the swinging of the saidarm in the opposite direction, substantially as described.

4E. The combination of the head A, the bar E, hung upon a pivot therein,the said bar constructed with an arm G, projecting therefrom in theplane of movement of the bar, the said arm constructed with a slot, a,slide I in the said slot, a crank the pin of which works in said slide,and an arm hung in the said bar and so as to vibrate therewith, butpermitting a swinging movement of its own in.

the plane of movement of the said bar, the said arm carrying ahammer-head, substantially as and for'the purpose described.

IIO

